I'm just doing this for practice designing PCBs with valves on, no immediate plans to produce this, but I was wondering if anyone knows the length and width and mounting hole positions (hole to hole spacing or hole to edge dimension, as long as I can work it out I'm not fussy ) for the PCB on this old favourite? I'd really appreciate it.

The question asked by poster KX36 is "anyone know the dimensions of a Dynakit ST-70 pcb". The dimensions given by poster 6BG6GA are not quite accurate and may reflect the size of the chassis cut out that the board fits. The board itself is somewhat larger than the chassis cut out.

The original Dynaco PC-3 driver board (Dynaco part # 557003) is 3.25 inches front to back by 6.50 inches side to side. The mount holes on the board are 4.00 inches apart side to side and 3.00 inches apart front to back. Each mount hole is exactly 1/8 inch on center from the edge of the board.

Thanks guys, that's awesome. The cutout dimension is useful too, perhaps more important than the actual board size. I'm really impressed with how quick and useful all the responses I've gotten to my questions here have been!

I gave you the cut out dims. Sorry about that. Anyone can plainly see after looking at the overall that the dims I gave were the cut out. Its very easy to print out the cut out size and use it for a template.

I use that for making my boards from a solid piece of PC board material without copper.

The dims for the stock board and the aftermarket boards do vary in length and width by as much as .020-.030 or more. Dims between different driver board manufacturers do also vary. I have three in front of me all different board designs and all vary in overall.